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if user sent the 1.5 ETH then accepted the 1 ETH, but 0.5 ETH should be refunded to sender.
I tried like msg.sender.transfer(0.5)
and tried like msg.sender.transfer(500000000000000000)
but nothing happened. I am not sure about that msg.sender.transfer is a right function.
is it possible do such way in Contracts?
Change 0.5 to 0.5 ether or to 500000000000000000.
owner.transfer(1.5 ether) ; its working fine. but msg.sender.transfer(500000000000000000) is not working.. its not credit 0.5 ether in my account.
Just to add a bit more complete answer: Solidity (and Ethereum) handle only full integers and no decimals in Ether values. All transactions happen in Wei which is the smallest unit of Ether (the cryptocurrency).
One Ether equals to 1000000000000000000 Weis - that is 10^18 Weis.
Therefore, whenever you want to transfer value withing the Ethereum blockchain, you use Weis as the amount and calculate the correct amount. So, in your case, 0.5 Ethers = 500000000000000000 Weis.
The transfer function takes as parameter to transfer in wei, so in order to send 0.5 ether you will have to transfer 500000000000000000 wei. And the parameter has to be an interger.
msg.sender.transfer(0.5 ether); may not be worked in modern versions of solidity.
transfer function can only be called in payable addresses.
So following code will work.
payable(address(msg.sender)).transfer(0.5 ether);
